supreme court decided to hear cases regarding federal laws, one regarding the defense of marriage act, or doma, involving couples legally married in their own state. the other is a challenge to california's prop 8, which took away the rates of same-sex marriage that had been previously approved by state courts. >>> the top story this hour, a man considered the leader of a terrorist network, now in custody in egypt. this is why we're paying attention to this man. u.s. officials believe his group had something to do with the attack in libya that killed the american ambassador and three other u.s. citizens. our national correspondent, susan candiotti is live for us. you have been working your sources. what do we know about this terror suspect and the group he leads? >> well, let's talk about him. the investigators have had this man on the radar for some time. and now he is being called a possible suspect in the benghazi attacks. muhammad ahmad was arrested, in custody while the investigation goes on. u.s. authorities believe he been involved in the september terror hit that killed ambassador chri